SIZE AND MASS OF BRANCHED EPOXY-RESINS

Citation
K. Grof et al., SIZE AND MASS OF BRANCHED EPOXY-RESINS, Polymer, 34(13), 1993, pp. 2816-2820
Citations number
31
Categorie Soggetti
Polymer Sciences
Journal title
ISSN journal
00323861
Volume
34
Issue
13
Year of publication
1993
Pages
2816 - 2820
Database
ISI
SICI code
0032-3861(1993)34:13<2816:SAMOBE>2.0.ZU;2-H
Abstract
Branched polymers were prepared from the bifunctional 4,4'-diglycidylo xy-2,2-diphenylpropane (diglycidyl ether of bisphenol A) and hexafunct ional poly(oxypropylene) diamine (Jeffamine T-403) at different distan ces from the gel point in the absence and presence of a diluent. Polym ers with different amounts of intramolecular cycles were prepared by d ilution during polymerization of the epoxide system with diglyme/butan ol mixed solvent. The static and dynamic light scattering from dilute solutions of these epoxide samples was measured. The results are discu ssed in terms of existing gelation theories. The critical exponents of M(w) lie between the values predicted by the Flory-Stockmayer and per colation theories and are shifted towards the percolation value with i ncreasing fraction of intramolecular cycles. Polymer growth near the g elation threshold is discussed.